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Kinda lame but useful and funny way of saying for sure or definately.
Also; fo deffs, def, deffy def, deffo McDefferson.
U comin tonite?
Deffo
deffo by Jake May 8, 2005
Short for definately.
Said in normal conversations.
"I'm defo keen to get fucked up."
DEFFO by Diego August 30, 2003
Gothenburg wigger slang. Short for definitely. Also used instead of "for real", when wanting to point out that something is very true or given.
- I deffo need some weed right now.

or

- This crib rocks!
- Deffo!
deffo by Japfreak January 3, 2004
Should we move forward on this deck? Deffo.
Deffo by par ez January 11, 2013
Deffo is a short form for defenetly.
"She deffo likes you."
Deffo by EhreEntwendet January 6, 2019
Another way of saying definetly; cooler
Friend 1: You saw the new assignment that the Spanish teacher posted?
Friend 2: Yeah, that shit is deffo gay
deffo by idrcuckiontop February 26, 2023